More Scaraveens (‘scairbhín’)‘, Garbh Mí na gCuach’ (the Rough Month of the Cuckoo), the period between April 15 and May 15, Alexander Buchan, Scottish Meteorologist.

Courtesy Irish Examiner, Mixed Messages.

https://durrushistory.com/2015/05/13/the-plants-wont-be-safe-from-frost-until-the-scaraveens-are-gone-15th-april-to-15th-may-scairbhin/

http://www.irishexaminer.com/lifestyle/outdoors/donal-hickey/farewell-to-rough-month-of-the-cuckoo-193747.html